Gas supply unit



Get. 22, 1963 A` v w, HORN ETAL 3,107,724 GAS SUPPLY UNIT w. H oRN ETAL 3,107,724'

GAS SUPPLY UNIT Oct. 22, 1963 Filed oct. 2e, 1960 Oct. 22, 1963 w. HORN ETAL 3,107,724 GAS SUPPLY UNIT Filed Oct. 26, 1960 5 She-ets-Sheet 5 4, 14 11014213@ Mza a zo l ATHIVEK United States Patent C 3,197,724 GAS SUPPLY UNET Waiter Horn, Hiiiside, and Frank P. Vuitaggio, Colonia, N5., assigncrs to Aero Supply Mfg. Co. inc., Linden, NJ., a corporation Fiiezi 9ct. 26, 1960, Ser. No. 65,208 17 Ciaims. (Si. 165-35) This invention relates to fresh air supply heater units.

In automatic fresh air supply heaters as heretofore made, air is yblown through alternating heated and bypassing passages arranged side by side. These passages heretofore were controlled by one set of dampers wholly within the inlet ends of the heated passages and one set of da-mpers wholly within the inlet ends of the by-pass pasages. Such dampers were controlled by thermostatic means. When maximum temperature rise was required, the dempers in the heated passages were wide open, and the danipers in the by-pass passages were completely closed. For less temperature rise, the dampers in the heated passages were gradually lclos-ed and the dampers in the by-pass passages were 4opened lan equal amount, the

egree of opening and closing being determined by fthe desired temperature rise. 'Ihe heated air from the heated passages and the unheated air from the by-pass passages would blend into la single stream, upon leaving the several passages.

One diiculty encountered with such prior construction has been the excessive resistance to air iiow, created during the temperature modulation range lwhen control dampers in the heat and by-pass zones were partially open and closed. The new construction provides a constant minimum resistance regardless of the modulating damper position.

Another difficulty with such prior construction has been that when the heated passages were closed at their inlet ends only, there was a pick up of a -feW degrees of temperature during flow through the unheated passages. This rise occurred because the heated passages were closed only at the inlet ends and some hearted air passed out `of the outlet ends to mix with the iiow of air through the by-pass passages.

It is hence an object of this invention to vprovide a fresh air supply unit heater of the character described in which these diiculties heretofore encountered are obviated.

Another object of this invention is to provide, in a heater of the character described, a casing having partitions dividing the casing into alternating heated and bypass passages, and dampers pivoted to the casing along the end edge of said partitions, each having a wing in one passage and a 'Wing in an adjacent passage, with moans to oscillate `adjacent dampers in opposite directions, Whereby, as the Wings in one passage close, the Wings in adjacent passages open.

Another object of this invention is. to provide in a heater of the character described, dampers each having a pair of transversely outwardly curved wings, angularly diverging from a joining intermediate portion xed to pins or axles about which the damper oscillates, whereby to minimize turbulence and resistance to air flow.

Yet another `object of this inevntion is to provide in la heater of the character described, means to close the heated passages at the inlet, while opening the by-pass passages at the inlet, by means of a set of primary dampers, and means to close the outlet ends of the heated passages by means of secondary dampers when the heated passages are in closed condition at the inlet. The reason for the secondary air dampers at the discharge side of the heated passages is to keep the temperature rise to a minimum when the heated passages are closed at the inlet sides thereof. When they are closed at the inlet,

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an actuating motor will then close dampers at the outlet sides of the heated passages to avoid pick up of heat during ilow through the unit. This feature reduces .the pick up of several degrees when the heat passages are closed oi.

A further object of this invention to provide in a heater of the character described, motor means to actuate the primary dampers, and means controlled by operation of the primary dampers, to actuate a second motor which aotuates the secondary dampers.

Still a further object of this invention is to provide a rugged vand durable heater of the character described, which shall be relatively inexpensive to manufacture, economical to operate, which shall be smooth and positive in actuation, and which shall yet be practical and eioient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter desired, and of which the scope of invention will be indicated in the following claims.

In the accompanying drawings in which is shown an illustrative embodiment of this invention.

l FIG. l is a front view of a heater embodying the invention;

FIG. 2 is a bottom view thereof;

1G. 3 is a right side view of the structure shown in FG. 1;

FIG. 4 is an `enlarged cross-sectional view taken on line 4 4 of FIG. l, turned horizontally;

FIG. 5 is an enlarged partial cross-sectional view taken on line 5 5 of FIG. l turned horizontally;

FiG. 6 is a cross-sectional view taken on line 6--6 of FG. 4; j

FIG. 7 is a cross-sectional view taken on line 7-7 of FIG. 3;

FIG. 8 is a cross-sectional view taken on line 8 8 of FlG..5;

FIG. 9 is a cross-sectional view taken on line 9 -9 of FIG. 3;

FIG. 10 is a cross-sectional view taken on line 1G-10n of FIG. 6; and

FIG. l'l is a wiring diagram of the motor control.

Referring now in detail to the drawings, 10 designates a fresh air supply unit heater embodying the invention. Sai-d heater comprises a casing 1:1 made of front inlet and rear outlet sections 12, 13, respectively. Inlet section 12 comprises a top panel 14, Ia bottom panel 15 and side panels 16 and 17 interconnecting said panels 14, `115. Panels 14, '15 overlap the ends of panels 16, 17.

Panel 14 comprises a recetangul-ar main wall 14a from the sides of which extend parallel flanges 14b.

Panel 15 comprises a rectangular main Wall 15a from which extends parallel side flanges 15b.

Panel 16 comprises a rectangular main Wall '16a from which extend parallel anges 16h.

Panel 17 comprises a rectangular main Wall 17a from which extend parallel side flanges 17b.

Rear outlet casing section 13 comprises a top panel 20, a bottom panel 21 and side panels 22, 23. Panels 20, 21 overlap the end-s of panels 212, 23.

Panel 29 com-prisesa rectangular main Wall 20a from which extend parallel side flanges Zub.

Panel 21 comprises a rectangular` main wall 21a from which extend parallel side flanges 2lb.

Adjacent Hangers 14b, Zibb `are welded or riveted together, and so are adjacent flanges 15b, 2lb, .1-6b, 22th and 17b, 23b, wtih pairs of main walls 14a, 20a; 15a, 21a; 16a, 22a; 17a, 23a in coplanar condition. This makes for a confined casing through which air may ber blown by a -fan (not shown) attached to section 12 so that air iiows through the casing.

The outer ends of iianges 14b are interconnected by reinforcing angle shaped members 18. The outer ends of iianges 15b yare interconnected by reinforcing angle shaped members 19.

At the inside of walls `14, 15, 20 and 21, are tixed inner walls '140, 15C, 20c and 21C, respectively. Attached to wall 16a of panel `16, and between walls 14C, 15C, are a pair of spaced, vertically extending symmetrical, Zshaped brackets 39 having outwardly extending flanges 39a, riveted or otherwise fixed to wall 16a, webs 3011, and inwardly extending flanges 30e. Fixed to liange 39C of one bracket is a wall 31 parallel to wall 16a. Fixed to the outer side of wall 31, adjacent one edge thereof, is a bar 32 in which are journalled three equally spaced pairs of equally spaced parallel, horizontal pins or axles 33, and horizontal pins 34, 35, spaced close to walls '14C and 15C, respectively. P-ins 33, 34, 35 pass through holes in wall 31.

Fixed to flange 30C of :the other bracket 39, is a wall 36 extending oppositely to and in the plane of wall 311, and carrying a bar 37 in which are journalled four horizontal pins or axles 38. One pin 3S is located equally between a pin 34 and the pin 33 adjacent thereto; one pin 3-8 is located equally between pin 35 and pin 33 adjacentthereto, and the other two pins 38 are located equally between adjacent pairs of pins 33.

Between brackets 30 and parallel thereto, are a pair of parallel, vertical steam pipes 40, 41. Pipe 40 is the steam inlet pipe and extends, as at 40a, through a suitable hole in bottom wall 15a. Steam is supplied to its lower end 43a. The upper end of pipe 40 is closed as at 4Gb. `Outlet pipe 41 passes upwardly through a suitable hole in wall 14a in an outlet end 41a. l-ts lower end 41h is closed.

Wall 17a of panel 17 has a vertical slot 42 closed by la cover plate 43 fixed to said wall as by rivets or screws 44. Attached to the inside of wall 17a is a vertical bar 45 Ato the inside of which is attached a wall 46 parallel to, and spaced inwardly of wall l17a and disposed forwardly of cover plate 43. Journalled in said bar 4S and wall 46 are axles or pins 33a, 34a, 35a aligned with pins 33, 34, 35 respectively.

Fixed to the inside of wal-l 17a, on the rear side ofV cover plate 43 is a vertical bar 50, to the inside of which is tixed a Wall 51, in the plane of wall 46 and spaced inwardly from said wall 17a. Journalled in bar 50 and wall 51 are axles or pins 38a aligned with pins 38.

Pins 33, 34, 35 project toward pins 33a, 34a, 35a. Pins 38 project toward pins 38a.

Fixed to walls 31 and 46 are three equally spaced pairs of equally spaced, horizontal partitions 55 in the horizontal planes of the axes of pins 33, 33a. Between each pair of partitions 55 is a by-pass passage 56. There are thus three by-pass passages shown. Between said pairs of partitions and also between the uppermost and lowermost partitions and the top and bottom panels are heated passages 57, heated in the manner hereinafter appearing.

Each pair of partitions are fixed together at their ends by channel-shaped brackets 58, 59 having web portions 58a and 59a iixed to walls 31 and 46, respectively, and

flanges 58h and 59h fixed to the insides of said pairs ofY partitions, as shown in FIG. 10.

Said partitions 55 have front edges 60 in a plane tangent to front sides of said pins 33, 34, 35, 33a, 34a, 35a, and are formed with notches 61 at the ends of said edges receiving said pins.

Fixed to the pairs of aligned pins 33, 33a are pairs of symmetrical, substantially similar inlet dampers 64, 65. There are three such pairs of dampers shown. Each pair of dampers 64, 65 comprises longitudinal intermediate curved portions 64a, 65a; inner transversely outwardly curved shorter wings 64b, 65h; and outer relatively longer transversely outwardly curved wings 64e, 65C. The ends of the curved portions 64a, 65a partially contact and are fixed to the aligned pins 33, 33a, by set screws or rivets 66 or in any other suitable manner. The wings 64a, 65a

are divergent relative to the wings 64b, 65h, respectively, making an angle of less than therewith. When the dampers 64, 65 are in the position of FIGS. 4 and 5, the heated passages 57 are open and the by-pass passages are closed. In such position, the outer ends of wings 64C, 65s` in the heat exchange passages 57, contact the partitions 55, while the outer ends of wings 64b, 65b in the by-pass passages 56, contact each other.

Fixed to pairs of aligned pins 34, 34a and 35, 35a are half dampers 68, 69, comprising curved portions 68a, 69a, respectively, contacting pairs of pins 35, 35a and 34, 34a, respectively, and wings 6817, 6911, similar to wings 65C and 64e, respectively, and projecting into the end heated passages 57, to cooperate with adjacent wings 64C and 65e, respectively. Curved portions 68a, 69a are fixed to pins 35, 35a and 34, 34a, respectively, by set-screws or rivets 79, 7 When the dampers 64, 65 are in the positions of FIGS. 4 and 5, dampcrs 63, 69 are in inwardly swung position close to panels 14 and 15 respectively, to keep the end heated passages 57, open.

Means, to be described hereinafter, is provided to oscillate dampers 64, 69 in directions opposite to dampers 65, 68, whereby to open the by pass passages 56 and close the heated passages 57, thereby bringing wings 64C and 6912 toward the wings 65C, 68h so that their end edges contact, and swinging wings 64b away from wings 65b.

Attached to the inner side of cover plate 43 and between the walls 46, 51 are channels 75, one located between wall 14C and the adjacent partition 55, and the other between wall 15C and the adjacent partition 55. Each channel 75 has a web 75a contacting cover plate 43, and parallel iianges '751: extending therefrom. Received in each channel member 75 is a channel member 76 having a web 76a from which extend flanges 76k engaging the inner surfaces of iianges 7513. Each web 76a is formed with four inclined slots 77 for the purpose hereinafter appearing. It will be noted that channels 75, 76 are located in the end heated passages 57.

Attached to the cover plate 43 and projecting into the intermediate two heated passages 57, are channels 7S similar to channels 75, and receiving channels 79 similar to channels 76, except for length and because their webs are formed with three inclined slots S0 instead offour slots 77. It will be noted that the end heated passages Y 57 are wider than the intermediate heated passages 57, although the widths may be varied.

Fixed to the inlet steam pipe 40 and outlet steam pipe 41 are steam pipes S1 having converging pipe portions 81a interconnected by curved or bent back pipe portion 31b passing through slots 77 and 80. Thus, there are four pipes 81 in each of the end heated passages 57, and three pipes S1 in each of the intermediate heated passages, but no pipes at all in the by-pass passages 56. With this arrangement, a heat exchanger or heat exchange means is provided in alternate passages of the unit.

Attached to wall 15C, is a strip 85 inclined away from said wall and substantially contacting curved portion 68a of adjacent damper 68, to prevent escape of heat from p between damper 68 and wall 15C when the heated passages are closed. Also, a strip 86 is attached to the inside of wall 14C, and it is inclined toward curved portion 69a of damper 69 and substantially contacting the same, to prevent escape of heat from between damper 69 and wall 14C when the heated passages are closed.

It will be noted that dampers 64, 65, 68, 69 are at the inlet ends of the passages in the casing.

Means is provided to close the outlet ends of the heated passages 57. To this end, there is mounted on each aligned pair of pins 38, 38a, a secondary or outlet damper 90. Each damper 90 comprises a damper plate 91 having a central V-shaped portion 92 from which extend co-planar wings 93 in the plane of the axes of aligned pins 38, 38a.

The pins 38, 38a are half received in the V-shaped portion 92. Clamps 94 are attached to the'` ends of damper blades 91. Each clamp 94 has a V-shaped portion 95 half receiving aligned pins 38, 33a, and wings 96 Contactin.q wings 3 and riveted thereto, as at 97. Pins 38, 38a may be iixed to dampers 9i) by welding or by screws or rivet 98, or in any other suitable manner. when the heated passages 57 are open, as shown in lFIGS. 4 and 5, the dampers 96 are open and parailel to the partitions 55 (in horizontal position).

Means is provided to simultaneously actuate all the dampers 64, 65, 68, `69 and 9G, to move same from the illustrated position in which the heated passages are open and the lay-pass passages are closed, to positions where the heated passages are closed at their inlet as well as their outlet ends, and the by-pass passages are ope-n.

To this end, there is fixed to the outside of panel 17, near its upper end, a bracket 160 supporting a motor 101 whose shaft rotates an arm 193 (FIG. 3). The motor shaft winds a return spring 102 which returns the shaft to starting point. A spring return Modutrol motor made by Minneapolis-Honeywell Regulator Company, under No. M905E may be used for this purpose. Attached to the outer end of arm 103 is a connecting rod M -for the purpose hereinafter appearing. Fixed to pin 35a and each of the pins 33a which are iixed to dampers 65, are crank arms 165 which are inclined upwardup and forwardly when the heated passages are closed. Pivoted to the outer ends of said cran-k arms 1% as at 167, is a long vertical operating bar 1&8. Fixed to pin 33a to which next to the lowest crank 1% is iixed, is an arm 199 inclined downwardly and rearwardly, and it is pivotally connected at its lower end to the lower end of connecting rod 15d, as at 199m Fixed to the pin 34a, and each of the pins 33a to which dampers 64 are attached, are crank arms 11,` extending horizontally rearwardly, as shown in FIG. 3, when the heated passages are open, as shown in lFIGS. 4 and 5. Pi-voted to the rear ends of crank arms 110, as at 111, is an elongated, vertical operating bar 112. The pivot 167 next to the lowermost, is connected to the pivot pin 111 next to the lowermost one by a connecting link 114, as shown in FIG. 3.

As shown in the wiring diagram of PIG. l1, an air stream thermostat 129 suitably placed in the air stream, automatically controls motor 101 connected to the electric supply line through a transformer 121. When the motor w1 rotates to move arm L03 in a clockwise direction, looking at I FIG. 3, said arm will pull up on connecting rod lil-t, to swing mm 1%9 in a counterclockwise direction, thereby to rotate the crank arms ldd in counter-clockwise directions (through bar 108, to thereby swing dampers 58, and 65, in counterclockwise directions. At the same time, downward movement of bar 19S causes connecting link 114 to pull down bar 112, to cause crank arms 11h to swing in clockwise directions to thereby cause dempers `69 and 64 to swing in clockwise directions. Such movement opens the by-pass passages 55, and closes the heated passages at their inlet ends.

Fixed to bar 112 is an actuating lug 13h. When bar 112 moves down, lug 13u?1 will also move down to actuate a switch 131 mounted on panel 1'7 and located in its path, to actuate a motor 132 connected to the power supply line through said transformer 121.

Motor 132 carries a lug 133. Pivoted to lug 133, is a lever 13d having one arm 134e pivoted to a moving part 135 of said motor. Attached `to the other arm 1346 of lever 131i, is a connecting rod 136 for the purpose hereinafter explained.

Pivoted to pins 3de are crank arms 145 which are inclined upwardly and rearwardly when the heated passages are open. Pivoted to the outer ends ot crank arms 140, as at 161, is an elongated, vertical operating bar 142. The upper end or" connecting rod 136 is pivoted to the pivot 141 next below the uppermost pivot.

When switch 131 is actuated by lug 135, motor 132. will raise movable member 135 to cause lever 134 to swing in a clockwise direction (i1-TIG. 3) to thereby pull down connecting rod 136, to pull down bar 142, to thereby swing crank arms 149 in a clockwise direction, and hence to swing the dampers from horizontal positions (with heated passages 57 open) to vertical positions to close the outlet ends of said heated passages.

in prior constructions, dampers were pivoted at the middle of the inlet ends of both the heated and by-pass passages, causing resistance to ow of air, and turbulence, thereby decreasing the capacity or output of the heater. In the present construction, the dampers 661, 65 58, 69 being pivoted at the sides of the passages, and the wings of the dampers being curved, resistance and turbulence is minimized.

The reason for using secondary dampers 90 at the discharge ends of the heated passages is to keep the temperatur-e from going up when the heated passages are closed. lf the outlet ends of the heated passages were not closed, while the inlet ends thereof are closed, then air iiowing through the by-pass passages could pick up several degrees in temperature. This is prevented by closing both the inlet and outlet ends of the heated passages to trap hot air in said passages.

If desired, the secondary dempers could be omitted, even though the eiiiciency is increased with them, in cases where the increase in eliiciency is not necessary.

Because of the basic Jfunction of the entire assembly,

a constant volume of air should be maintained through the casing in all positions of the dampers. Since the heat exchange pipes S1 cause resistance to flow in the heat exchange passages, said passages, as shown in the drawing are wider than the by-pass passages and hence the dampers at the inlet end have longer vanes in the heat exchange passages. It will be noted that the passages at their inlet ends always open at the middle and the openings expand from the middle outwardly to provide lfor central flow in the passages `which open. Also the dampers at the same time provide curved nozzle openings to facilitate liiow of air or gas.

lt will be understood that while the unit has been described in connection with heating air, it will be obvious that it coul-d be used equally eiectively to treat any gaseous tlow. The steam heating means is of course a heat exchanger or heat exchange means. Exchange means could be used to effect cooling of such gas Iflow by emloying a coolant instead of steam in the heat exchange means.

It :will thus be seen that there is provided an apparatus in which the several objects of this invention are achieved, and which is well adapted to rneet the condi-tions of practical use.

As possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth, it is to be under-stood that all matter herein set forth or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

We claim:

l. ln a gas supply unit, a casing having an inlet and an outlet and provided with parallel partitions between the inlet and outlet, dividing the casing into alternate passages for gas to be treated and passages for gas to be by-passed, heat exchange means in the alternate passages for gas to be treated, dampers at the inlet sides of the assages, pivoted at one'edge of the respective partitions about parallel axes, teach disposed substantially in the plane of one of said partitions, and each damper having an inner wing and an outer wing ixed with respect to each other in diverging relation and projecting into the passages on opposite sides of the partition relativeV to which it is pivoted, the wings of each damper being transversely outwardly curved throughout, with the outer wings of adjacent dampers substantially contacting outer sides of adjacent partitions when the inner wings of said 7 dempers contact one another, and means to oscillate adjacent dampers in opposite directions.

2. A gas supply unit, comprising: a casing having an inlet and an outlet, parallel partitions in said casing dividing the casing into alternate treating and gas by-.pass passages between the inlet and outlet, heat exchange means in the gas-treating passages, between the inlet and outlet, pairs of aligned pins journalled in the casing at the ends of and in the planes of the partitions at the inlet side of the passages, dampers iixed to said aligned pairs of pins, and having diverging wings projecting ,to opposite sides of the partitions, with adjacent wings of each pair of ladjacent dempers projecting toward each other in opposite positions of :said adjacent dampers, to close off the passage between said adjacent dampers, a set of crank arms iixed to pins located at alternate partitions, a bar interpivoted to the crank arms, a second set of crank arms fixed to pins located at partitions which alternate with the first-mentioned parti-tions, a bar interpivoted to the second set of crank arms, a link connecting said bars, land means to cause rotation of one `of said crank `arms to move both said bars and the .crank arms pivoted thereto.

3. A uni-t as defined in claim 2, wherein a second set of dampers is disposed within the gas-treating pass-ages at the outlet, and means controlled by the rotating means to -actuate the second set of dampers.

4. A unit as delined in claim 2, wherein the means to cause rotation of lone of the crank arms comprises a motor, a thermostat controlling said motor, and means connecting said motor with said rotating means.

5. A unit as defined in cla-im 2, including a set of dampers Within the outlet ends of the air-treating passages, pins journalled in said casing and fixed -to said lastmentioned dempers, crank arms pivoted to pins xed -to said last-mentioned dempers, a bar interpivoted to said last-mentioned crank arms, a second motor, 4means controlled by the second motor yto move said last-mentioned bar, and means controlled by movement of one of the iirst two-mentioned bars to actuate the second motor to move said last-mentioned bar and the last-mentioned dampers.

6. A gas supply unit, comprising a casing having an inlet end and an outlet end, a plurality of parallel parti- .tions in the casing disposed between the inlet end and the outlet end and dividing said casing into a plurality of parallel passages, heat exchange means in alternate passages of the casing to provide heat exchange passages alterna-ting with by-pass passages, a plurality or pairs of adjacent dampers pivoted about parallel, co-planar axes disposed in the planes of said partitions at the inlet end, each damper having a pair of fwings consisting of an inner win-g and an outer wing movable together, about the pivotal axis of said damper, and extending to opposite sides of a partition, each pair of adjacent dampers, in one position lthereof, having their inner wings projecting toward each other and closing a iirst passage between the pair of partitions disposed in lthe planes of the axes of one pair of adjacent dempers, and having their outer wings located close to the outer sides of said pair of partitions to keep the passages on opposite sides of said iirst passage open, and means to simultaneously 4oscillate said one pair of said adjacent dempers in opposite directions to another position of said dempers to move the inner wings of said one pair of dampers away from each other and toward the inner sides of said pair of partitions, to open said lirst passage, and to move the outer wings of said one pair of adjacent dampers outwardly and away from the outer sides of said pair of pantitions.

7. A gas supply unit as delined in claim 6, including end dampers pivoted at opposite sides fof the casing and located within inlet sides of end passages at said sides of the casing, #and movable from positions adjacent the oppo site sides of the casing .to positions transverse of lsaid end passages, and means controlled by oscillation of said firstmentioned dampers to oscillate said end dampers oppositely to the first-mentioned dampers.

8. In a gas supply unit, a casing, Ia plurality of parallel partitions in the casing dividing said casing into parallel passages having inlet ends and outlet ends, heat exchange means in alternate passages between the inlet and outlet ends thereof to provide gas-treating passages alternaiting with gas by-pass passages, dempers at the inlet ends of the passages, pivoted in said casing on parallel axes disposed in planes common to the planes of said partitions and having lwings projecting ,to opposite sides of said partitions, and means for simultaneously oscillating said dampers in Aopposite directions.

9. The combination lof claim 8, the heat exchange passages being wider than said by-.pass passages, the wings of each damper diverging from each other, and the wings in the heat exchange passages being longer than the wings in the by-pass passages.

l). The combination of claim 9, and said wings being outwardly curved throughout.

ll. In a gas supply unit, a casing having an inlet and an outlet, a plurality of spaced partitions in the casing dividing said casing into passages between said inlet and outlet, heat exchange means in alternate passages to provide heat exchange passages alternating with by-pass passages, and a pair of similar symmetrical dampers at the inlet ends of each adjacent pair of partitions, means to move the dempers of each pair oppositelly Iwith respect to a plane centrally between them, and said dampers having means to open the by-pass passages from the middles of said lay-pass passages outwardly toward the partitions on opposite sides of said by-pass passages, and 'to concurrently close the heat exchange passages from the partitions on opposite sides of said heat exchange passages inwardly toward the middle of said heat exchange passages upon moving the dampers of said pairs of dampers oppositely. v

l2. The combination of claim ll, said dempers comprising means to provide curved nozzles at 'the openings in the passages to facilitate flow therethrough.

13. The combination of claim 11, and heat sensitive means to control said moving means.

14. The combination of claim 13, dampers at the outlet ends of said heat exchange passages, adapted to close said heat exchange passages, and means controlled by the rst dam-pers to actuate said other dempers.

15. A gas supply unit, comprising a casing having an inlet end and an outlet end, a plurality of parallel partitions in the casing disposed between the inlet end and the outlet end and dividing said cas-ing into a plurality of parallel passages, heat exchange means in alternate passages of the casing -to provide heat exchange passages alternating with by-pass passages, a plurality of pairs of adjacent dampers pivoted about parallel, coplanar axes disposed in the planes of said partitions at the inlet end, each damper having a pair of wings consisting of an inner wing and on outer wing movable together, about the pivotal axis of said damper, and extending to opposite sides of a partition, each pair of adjacent dampers,

in one position thereof, having their inner wings project- Y ing toward each other and closing a first passage between the pair of partitions disposed in the planes of the axes of one pair of adjacent dempers, and having their outer wings located closed to the outer sides of said pair of partitions 4to keep the passages on opposite sides of said rst passage open, means to simultaneously oscillate said one pair of said adjacent dampers in opposite directions :to another position of said dampers to move the inner wings of said one pair of dampers away from each other and toward the inner sides of said pair of partitions, to open said irst passage, and to move the outer wings of said one pair of adjacent dampers outwardly and away from the outer sides of said pair of partition-s, outlet Edampers located Within and at the outlet ends of the hea-t exchange passages and arranged in positions to open said heat exchange passages when the inlet ends of said heat exchange passages are open and the gas by-pa-ss passages are closed by the inlet dampers, and means to move the dampers fat the outlet ends from said open position to close said heat exchange passages upon movement of the inlet dampers from positions opening the heat exchange passages and closing the gas by-pass passages, to positions closing the heat exchange passages and opening the gas by-pass passages.

16. A gas supply unit, comprising a casing having an inlet end and an outlet end, a plurality of parallel partitions in the casing disposed between the inlet end and the outlet end and dividing said casing into a plurality of parallel passages, heat exchange means in alternate passages of the casing to provide heat exchange passages alternating with by-pass passages, a plurality of pairs of adjacent dampers pivoted about parallel, co-planar axes `disposed in the planes of said partitions at the inlet end, each damper having a pair of wings consisting of an inner wing and lan outer wing movable together, about the pivotal axis of said damper, and extending to opposite sides of a partition, each pair of adjacent dampers, in one position thereof, having their inner wings projecting toward each other and closing a first passage between the pair of partitions disposed in the planes of the axes of one pair of adjacent dampers, and having their outer wings located close to 4the outer sides of said pair of partitions to keep the passages on opposite sides of said first passage open, means to simultaneously oscillate said one pair of said adjacent dampers in opposite directions to another position of said dampers to move the inner wings of said one pair of dampers away from each other and toward the inner sides of said pair of partitions, to open said first passage, and to move the outer wings of said one pair of adjacent dampers outwardly and away from the outer sides of said pair of partitions, said wings of each damper diverging from the axis of said damper and projecting into adjacent passages.

17. A gas supply unit, comprising la casing having an inlet end and an outlet end, a plurality of parallel partitions in the casing 4disposed between the inlet end and the outlet end and dividing said casing into a plurality of parallel passages, heat exchange means in alternate passages of the casing to provide heat exchange passages alternating with by-pass passages, a plurality of pairs of adjacent dampers pivoted about parallel, co-planar axes disposed in the planes of said partitions at the inlet end, each damper having a pair of wings consisting of an inner wing and an outer wing movable together, about the pivotal axis of said damper, and `extending to opposite sides of a partition, each pair of adjacentvdampers, in one position thereof, having their inner wings projecting toward each other and closing a first passage between the pair of partitions disposed in the planes of the axes of one pair of adjacent dampers, and having their outer wings located close -to the outer sides. of said pair of partitions .to keep the passages on opposite sides of said first passage open, means to simultaneously oscillate said one pair of said adjacent dampers in opposite directions to another position of said dampers to move the inner wings of said one pair of dampers away from each other and toward the inner sides of said pair of partitions, to open said lirst passage, and to move the outer wings of said one pair of adjacent dampers outwardly and away from the outer sides of said pair of partitions, said wings of each :damper diverging from the axis of said damper and projecting into adjacent passages, each wing being transversely outwardly curved throughout its length.

References Cited in the le of this patent UNITED STATES PATENTS 1,754,260 Callahan Apr. 15, 11930 v1,816,217 Harnett July 28, 193,1 `1,847,609 Harnett Mar. l, 1932 2,224,312 ODay Dec. 10, 1940 OTHER REFERENCES Wing Manufacturing Company, Bulletin HS-l, copyright 1939, page 5 relied on.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent. No 3107,724 October 22 1963 Walter Horn et al.,

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the granty lines 2 and 3, for "assignors to Aero Supply Mfg. Co. Inc. of Lindenu New Jerseyv a corporation"1 read assignors to Aero-Flow Dynamicsu Inc. a corporation of New York, line 12 for "Aero Supply Mfg.. Co 1nc its successors" read Aero-Flow DynamicsE Inc.. 9 its sucoessors in the heading to the printed specificaton lines 4 and 5v for' "assgnors to Aero Supply Mfgu C0. Inc. Lnden N. J a corporation" read assgnors to Aero-Flow Dynamicsc Inc. a corporation of New York Signed and sealed this 12th day of May 1964.o

SEAL) mest:

RNEST W. SWIDER y EDWARD J. BRENNER lttestlng Offlcer Commissioner of Patents 

15. A GAS SUPPLY UNIT, COMPRISING A CASING HAVING AN INLET END AND AN OUTLET END, A PLURALITY OF PARALLEL PARTITIONS IN THE CASING DISPOSED BETWEEN THE INLET END AND THE OUTLET END AND DIVIDING SAID CASING INTO A PLURALITY OF PARALLEL PASSAGES, HEAT EXCHANGE MEANS IN ALTERNATE PASSAGES OF THE CASING TO PROVIDE HEAT EXCHANGE PASSAGES ALTERNATE WITH BY-PASS PASSAGES, A PLURALITY OF PAIRS OF ADJACENT DAMPERS PIVOTED ABOUT PARALLEL, COPLANAR AXES DISPOSED IN THE PLANES OF SAID PARTITIONS AT THE INLET END, EACH DAMPER HAVING A PAIR OF WINGS CONSISTING OF AN INNER WING AND AN OUTER WING MOVABLE TOGETHER, ABOUT THE PIVOTAL AXIS OF SAID DAMPER, AND EXTENDING TO OPPOSITE SIDES OF A PARTITION, EACH PAIR OF ADJACENT DAMPERS, IN ONE POSITION THEREOF, HAVING THEIR INNER WINGS PROJECTING TOWARD EACH OTHER AND CLOSING A FIRST PASSAGE BETWEEN THE PAIR OF PARTITIONS DISPOSED IN THE PLANES OF THE AXES OF ONE PAIR OF ADJACENT DAMPERS, AND HAVING THEIR OUTER WINGS LOCATED CLOSED TO THE OUTER SIDES OF SAID PAIR OF PARTITIONS TO KEEP THE PASSAGES ON OPPOSITE SIDES OF SAID FIRST PASSAGE OPEN, MEANS TO SIMULTANEOUSLY OSCILLATE SAID ONE PAIR OF SAID ADJACENT DAMPERS IN OPPOSITE DIRECTIONS TO ANOTHER POSITION OF SAID DAMPERS TO MOVE THE INNER 